{"id":"CVE-2026-63870","summary":"ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()\n\nThe aoe driver (or similar) generates a non-IPv6 packet\n(e.g., ETH_P_AOE) and queues it for transmission via dev_queue_xmit()\non a 6LoWPAN interface (configured by the user or test case).\n\nSince the packet is not IPv6, the 6LoWPAN header_ops-\u003ecreate function\n(lowpan_header_create or header_create) returns early without initializing\nthe lowpan_addr_info structure in the skb headroom.\n\nIn the transmit function (lowpan_xmit), the driver calls lowpan_header\n(or setup_header) which unconditionally copies and uses the lowpan_addr_info\nfrom the headroom, which contains uninitialized data.\n\nFix this by dropping non IPv6 packets.\n\nA similar fix is needed in net/bluetooth/6lowpan.c bt_xmit().","modified":"2026-08-12T03:51:37.888815147Z","published":"2026-07-19T14:18:39.113Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63870.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1a827b95e62b4cbe851ae7cc9c961cdfa769cca4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/285b0842f2e01c3edf805f1fd64da11d9b7f6b4c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3150e6d3223dfc356308125cabf9c34169842d2a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/87172cc8dc49aaf54407a31edffb0232f8cb93ab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8da95cb6ad7d656c871e776a9c7b77e894d6d89c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/af07fffbd53ddc3ec3c2a4ca914f27899fa89bca"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c1819c8defa235c7beda859bc185b1c429a55ecd"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63870.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63870"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4dc315e267fe4a3c863fec21f26aa0a418c3f07a"},{"fixed":"af07fffbd53ddc3ec3c2a4ca914f27899fa89bca"},{"fixed":"3150e6d3223dfc356308125cabf9c34169842d2a"},{"fixed":"8da95cb6ad7d656c871e776a9c7b77e894d6d89c"},{"fixed":"1a827b95e62b4cbe851ae7cc9c961cdfa769cca4"},{"fixed":"c1819c8defa235c7beda859bc185b1c429a55ecd"},{"fixed":"285b0842f2e01c3edf805f1fd64da11d9b7f6b4c"},{"fixed":"87172cc8dc49aaf54407a31edffb0232f8cb93ab"},{"fixed":"3a5f3f7aff18bcc36a57839cf50cf0cc8de707f3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63870.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63870.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}